ok dug into one, looks like it spun the rod bearings


why would a motor do this? it looks as if it has been rebuilet no to long ago.
i noticed as well that the caps for the rods 3 out of 4 were shaved/ground down?


and somthing eles all three motor have differnt lettes on the end caps this one has an A the other short block has F and the long block i thing was an E.???
one rod cap was taken off alread was finger tight on the other short block it to had spun the bearing it was a std. have not touch the long block

Bearings look trashed but the crank is not scored?

That motor was balanced. Looks like the rods had quite a bit of weight mismatch and the heavy ones were ground down to get them to match..

yea i was think about that after i posted and was looking noticed they were not evenly done so i thought that it might have been done to balance. i never new these motor ate up bearings like that. all three block i have have toasted bearings witch is not a bad thing per-say becuse all the cranks look really good. no real damage. i would say that whom ever was driveing this new what to listen for and pulled them right away. aallthough the long block i know why the bearings went. the balance shaft went from the look of the guide rail not sure i know the top shaft moves when pulled but it does not wiggle that i noticed.
these motors are kinda wired to me the way you have the balance shaft. one off the oil pump and then that top one. weird is all i can say. iam going to assume witch is not always a good thing. that who ever drove these motors was pushing a lot of psi through there turbo at creating a big load on the bearings seeing how its mainly the rod bearings that are toasted. but hey just a thought.
funny thing the to short blocks had the oil pump with the pick up coming off the pump and running to the oil pan the long blcok and the right type of oil pump useing the passage in the block. bummer. becuse the two oil pump that i cant use look almost new.
so i need some rings,not sure what crank i will use that will determine if i need over sized or not.new oil pump, and a complete gasket kit with the t head gasket.
out of the 4 heads i have two are good for sure the other two i will have to get tested looks like there mite be some hire line cracks or the start of one in 2 and 3 between the valves

[quote]Bearings look trashed but the crank is not scored?

oh that crank was not an any of the three block it was just a crank he had laying around. that happend to be good

Looks like overloading damage to me, like the babbit de-laminated from the shell, rather than melting from no oil. Could explain the non-damaged crank throws.

One thing I haven't seen in this thread, arent the Turbo pistons lower compression? Dished vs. flat tops? Something like 7.5-1 vs 8.5-1?

yes the compression is lower. you are right and i am not sure but i belive it is all becuse the piston is dish.
i am not sure how this will effect the motor. seeing how i will be useing this as a non turbo applaction, i see no sence in swapping pistions and ring when this looks to be almost new,

Curious on the bearings, did both the upper and the lower shells in the rods have the same damage? Or was it just the uppers?

You can run the low compression pistons and have a turbo ready motor. Each point of compression ration that you drop drops your power and fuel economy about 3%.

A new set of cast pistons with rings should cost around $120, plus the cost to press them off.

You should also get the rods checked to make sure they are not out of round.

Stock turbo pistons are 7.0:1. NA pistons are 8.7:1.

yes both upper and lower had the same damage.

i will be takeing two cranks to get polished today and i will take the two head that look good
and have them check out and surfaced if needed, with prusse test done